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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
75d10e326f
Following #875, diagnose any use of a name prior to the point where it is introduced and its type is known. This works by performing name resolution on a top-level class, interface, or impl twice: the first pass performs name-resolution for everything other than nested function bodies, and the second pass performs name resolution on function bodies. At the moment, the second pass does a superset of the work done by the first pass, and as a consequence, some identifier expressions now have their target set twice to the same thing.
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "explorer/ast/static_scope.h"
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#include "explorer/common/error_builders.h"
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#include "llvm/Support/Error.h"
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namespace Carbon {
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auto StaticScope::Add(const std::string& name, ValueNodeView entity,
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bool usable) -> ErrorOr<Success> {
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auto [it, inserted] = declared_names_.insert({name, {entity, usable}});
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if (!inserted) {
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if (it->second.entity != entity) {
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return CompilationError(entity.base().source_loc())
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<< "Duplicate name `" << name << "` also found at "
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<< it->second.entity.base().source_loc();
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}
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CARBON_CHECK(usable || !it->second.usable)
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<< entity.base().source_loc() << " attempting to mark a usable name `"
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<< name << "` as unusable";
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it->second.usable |= usable;
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}
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return Success();
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}
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void StaticScope::MarkUsable(const std::string& name) {
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auto it = declared_names_.find(name);
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CARBON_CHECK(it != declared_names_.end()) << name << " not found";
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it->second.usable = true;
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}
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auto StaticScope::Resolve(const std::string& name,
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SourceLocation source_loc) const
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-> ErrorOr<ValueNodeView> {
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CARBON_ASSIGN_OR_RETURN(std::optional<ValueNodeView> result,
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TryResolve(name, source_loc));
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if (!result) {
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return CompilationError(source_loc) << "could not resolve '" << name << "'";
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}
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return *result;
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}
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auto StaticScope::TryResolve(const std::string& name,
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SourceLocation source_loc) const
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-> ErrorOr<std::optional<ValueNodeView>> {
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auto it = declared_names_.find(name);
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if (it != declared_names_.end()) {
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if (!it->second.usable) {
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return CompilationError(source_loc)
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<< "'" << name
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<< "' is not usable until after it has been completely declared";
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}
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return std::make_optional(it->second.entity);
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}
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std::optional<ValueNodeView> result;
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for (Nonnull<const StaticScope*> parent : parent_scopes_) {
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CARBON_ASSIGN_OR_RETURN(std::optional<ValueNodeView> parent_result,
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parent->TryResolve(name, source_loc));
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if (parent_result.has_value() && result.has_value() &&
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*parent_result != *result) {
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return CompilationError(source_loc)
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<< "'" << name << "' is ambiguous between "
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<< result->base().source_loc() << " and "
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<< parent_result->base().source_loc();
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}
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result = parent_result;
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}
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return result;
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}
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} // namespace Carbon
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